Why certain chemical species are more stable as compared to other?

The enthalpy of formation of water is -285.8 kj/mol. what can be inferred from this statement?

Sarah wants to know where in her garden chamomile would grow the best. she thinks chamomile will grow best in the corner of the garden that gets the most sunlight. to test her hypothesis, she decides to plant several groups of chamomile in her garden as an experiment. which of the following variables will sarah need to measure to know which group of plants grew best? a. the location of the plants b. the type of plants c. the height of the plants d. the amount of water she gives the plants

Define dew point. i am writing this part to be able to ask the question